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Business Combinations - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition |  |  |  |
Goodwill acquired |  |  | $ 354,698 | $ 360,480
Privately-Held Company, September 30, 2018 Acquisition |  |  |  |
Business Acquisition |  |  |  |
Total purchase consideration | $ 4,100 |  |  |
Additional contingent consideration, liability | $ 1,500 |  |  | 900
Privately-Held Company, July 11, 2018 Acquisition |  |  |  |
Business Acquisition |  |  |  |
Total purchase consideration |  | $ 11,300 |  |
Additional contingent consideration, liability |  | $ 4,500 |  | $ 1,600
Product line from Keysight Technologies, Inc. |  |  |  |
Business Acquisition |  |  |  |
Total purchase consideration |  |  | 12,100 |
Goodwill acquired |  |  | $ 5,200 |

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